189481913 has 4 divisors (see below), whose sum is σ = 191252880. Its totient is φ = 187710948.

The previous prime is 189481909. The next prime is 189481961. The reversal of 189481913 is 319184981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 319184981 = 73 ⋅4372397.

It is a cyclic number.

It is not a de Polignac number, because 189481913 - 2² = 189481909 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189481013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 885323 + ... + 885536.

It is an arithmetic number, because the mean of its divisors is an integer number (47813220).

Almost surely, 2^189481913 is an apocalyptic number.

It is an amenable number.

189481913 is a deficient number, since it is larger than the sum of its proper divisors (1770967).

189481913 is a wasteful number, since it uses less digits than its factorization.

189481913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1770966.

The product of its digits is 62208, while the sum is 44.

The square root of 189481913 is about 13765.2429328363. The cubic root of 189481913 is about 574.3667008565.

The spelling of 189481913 in words is "one hundred eighty-nine million, four hundred eighty-one thousand, nine hundred thirteen".